Transformer oil-SF6 bushing interface high efficiency test device

Abstract

The present invention belongs to the technical field of transformer oil-SF6 bushing interface test devices and discloses an efficient transformer oil-SF6 bushing interface test device, comprising a test device including a test riser, a test bushing, a disconnect switch, and a contact seat. The oil-SF6 bushing includes a first lead, an interface, a first and a second equalizing ball, with the first lead disposed below the oil-SF6 bushing. By integrating the riser, the oil-SF6 bushing, the test riser, the test bushing, the disconnect switch, and the contact seat, the present invention enables connection and disconnection of a test circuit without disassembling the test device. After disconnection, the disconnected portion of the test device meets the insulation requirements of electrical testing, significantly improving factory testing efficiency. The test device features a compact structure, ease of maintenance, and high cost-effectiveness, providing a new and efficient testing solution for transformers using oil-SF6 bushings.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer oil-SF6 bushing interface test devices, in particular to a transformer oil-SF6 bushing interface high-efficiency test device. Background Art

[0002] The oil end of the oil-SF6 bushing is connected to the transformer, and the SF6 end is connected to the GIS. Due to this structural feature, during factory testing, an oil-air bushing or SF6-air bushing (dry bushing) must be used to connect the oil-SF6 bushing, and then voltage must be applied from the air end of the bushing to perform a high voltage test.

[0003] When using the oil-air bushing for factory testing, since the oil-air bushing and the oil-SF6 bushing are connected in parallel, when voltage is loaded, the current flows directly into the transformer coil through the oil-air bushing and the lead, and the current does not pass through the oil-SF6 bushing, making it impossible to test and verify the oil-SF6 bushing.

[0004] When using SF6-air bushings (dry bushings) for factory testing, the SF6-air bushings (dry bushings) are connected in series with the oil-SF6 bushings. If it is a non-capacitive SF6-air bushing (dry bushing), since there is no test tap, it is difficult to determine whether the partial discharge is from the bushing or the transformer during the partial discharge test, which makes it difficult to determine the location of the partial discharge. In addition, when conducting a long-term induction withstand voltage test, the high voltage induced by the transformer coil will be transmitted to the SF6-air bushing (dry bushing). The end of the SF6-air bushing (dry bushing) is energized and the test duration is very long. In this state, the operation of other equipment (crane) will interfere with the test. In addition, due to the complex structure and relatively high price of the SF6-air bushing (dry bushing), the cost performance is low.

[0005] The present invention provides an efficient test device for the transformer oil-SF6 bushing interface. The device has the characteristics of compact structure, low cost, high reliability, etc. The efficient test device for the transformer oil-SF6 bushing interface can not only effectively determine whether it is a bushing partial discharge or a transformer partial discharge during the test, but also can quickly disconnect the test bushing from the transformer, thereby improving the efficiency during the test. Summary of the Invention

[0006] The object of the present invention is to provide a high-efficiency test device for transformer oil-SF6 bushing interface to solve the problems raised in the above background technology.

[0007] In order to achieve the above object, the present invention provides the following technical solutions: a transformer oil-SF6 bushing interface high-efficiency test device, comprising a test device, the test device including a test riser, a test bushing, a disconnect switch and a contact seat and their supporting components;

[0008] The supporting components include a first riser and an oil-SF6 bushing;

[0009] The oil-SF6 casing includes a first lead, an interface, a first pressure-equalizing ball, and a second pressure-equalizing ball. The first lead is arranged at the lower part of the oil-SF6 casing, the interface is arranged at the upper part of the oil-SF6 casing, the first pressure-equalizing ball is placed inside the lower part of the oil-SF6 casing, and the second pressure-equalizing ball is placed inside the upper part of the oil-SF6 casing.

[0010] The surface of the test elevation seat is provided with a manhole and a pressure relief device from top to bottom;

[0011] The lower end of the test sleeve is provided with a transfer raising seat, and a shield is provided on the upper flange of the transfer raising seat. The shield and the transfer raising seat are fixedly connected by insulating bolts. A pressure gauge and a test tap are symmetrically installed on the left and right sides of the external surface of the transfer raising seat. A second lead is provided between the shield and the test tap. A first conductive rod is movably installed inside the test sleeve, and the shield is coaxially arranged with the outer side of the first conductive rod. A third equalizing ring is movably installed on the surface of the top of the upper end of the test sleeve, and a terminal board is movably installed on the top of the upper end of the test sleeve, and the terminal board is electrically connected to the external test equipment;

[0012] The disconnect switch includes an operating handle, a joystick, a gear set, a conductive head, a second conductive rod, a ball screw, a first contact finger and a third equalizing ball. The conductive head is arranged inside the upper end of the test elevation seat, the second conductive rod and the first contact finger are arranged inside the conductive head, the conductive head and the second conductive rod are electrically connected through the first contact finger, the ball screw is arranged inside the second conductive rod, the gear set is arranged at the upper end of the ball screw, the left end of the joystick is movably connected to the gear set, the operating handle is fixedly mounted on the top of the other end of the joystick, the upper end of the conductive head is flange-connected to the first conductive rod, and the third equalizing ball is arranged at the connection between the upper end of the conductive head and the conductive head;

[0013] The contact seat includes a flange, a contact seat head and a third conductive rod. The contact seat head, the third conductive rod and the flange are connected from top to bottom by welding. A groove is provided inside the contact seat head, and a second contact finger is embedded in the groove.

[0014] Preferably, the interior of the first elevation seat is filled with transformer oil, and the first elevation seat is mechanically connected to the transformer.

[0015] Preferably, the upper portion of the oil-SF6 bushing is connected to the flange of the contact seat through an interface, and the lower portion of the oil-SF6 bushing is electrically connected to the transformer through a first lead.

[0016] Preferably, the test lift seat and the oil-SF6 bushing are connected and sealed via a flange interface, and the lower part of the oil-SF6 bushing is connected to the first lift seat via a flange interface.

[0017] Preferably, the test riser and the test sleeve are the main components of the exterior of the test device. The test riser and the test sleeve are connected via a transfer riser, are connected and sealed to each other using a flange interface, and are filled with SF6 gas.

[0018] Preferably, the test tap is grounded when conducting a high voltage test, that is, the shield is grounded, which serves to connect a uniform electric field. When conducting a partial discharge test, the test tap is led out, and the shield acts as a capacitive screen for partial discharge measurement.

[0019] Preferably, the rotation of the operating handle will drive the joystick, gear set, and ball screw, thereby extending and retracting the second conductive rod, thereby connecting and disconnecting the circuit between the test bushing and the oil-SF6 bushing and the transformer.

[0020] Preferably, after the second conductive rod is extended, the head of the second conductive rod is inserted into the contact seat head and contacts the second contact finger, and the test bushing is electrically connected to the oil-SF6 bushing and the transformer.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention cooperates with structures such as a riser, an oil-SF6 bushing, a test riser, a test bushing, a disconnect switch, and a contact seat. Therefore, when a transformer equipped with an oil-SF6 bushing is tested in a factory, the test device can be filled with SF6 and meet the gas sealing requirements. During the test, the capacitor screen on the test bushing in the device is connected to the partial discharge monitoring circuit, which can accurately determine whether it is partial discharge of the transformer bushing or partial discharge of the transformer. The test circuit can be connected and disconnected without disassembling the test device. After the test device is disconnected, the disconnected part can meet the insulation requirements of the electrical test, greatly improving the efficiency of factory testing. The test device has the characteristics of compact structure, easy maintenance, and high cost performance, and provides a new and efficient testing solution for transformers using oil-SF6 bushings.

[0023] 2. The present invention, through the coordination of structures such as the riser, oil-SF6 bushing, test riser, test bushing, disconnect switch and contact seat, can functionally meet the pressurization requirements during oil-SF6 bushing testing in electrical tests of transformers equipped with oil-SF6 bushings at voltage levels above 220 kV, and can also be used for monitoring local amplification of the transformer. It can also realize the opening and closing functions of the circuit under various test conditions and meet the insulation requirements under high voltage conditions during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the front view of the high-efficiency test device for the transformer oil-SF6 bushing interface of the present invention;

[0025] Figure 2 This is a side structural schematic diagram of the transformer oil-SF6 bushing interface high-efficiency test device of the present invention;

[0026] Figure 3 A schematic diagram of the side cross-sectional structure of the transformer oil-SF6 bushing interface high-efficiency test device of the present invention and a schematic diagram of the state in which the test bushing is disconnected from the transformer circuit;

[0027] Figure 4 It is a schematic diagram of the side cross-sectional structure of the transformer oil-SF6 bushing interface high-efficiency test device of the present invention and a schematic diagram of the connection between the test bushing and the transformer circuit.

[0028] In the figure: 1. First riser; 2. Oil-SF6 bushing; 201. First lead; 202. Interface; 203. First equalizing ball; 204. Second equalizing ball; 3. Test riser; 301. Manhole; 302. Pressure relief device; 4. Test bushing; 401. Adapter riser; 402. Shield; 4021. Second lead; 403. Test tap; 404. First conductive rod; 405. Pressure gauge; 406. Equalizing ring; 407. Terminal board; 5. Disconnector; 501. Operating handle; 502. Joystick; 503. Gear set; 504. Conductive head; 505. Second conductive rod; 5051. Ball screw; 506. First contact finger; 507. Third equalizing ball; 6. Contact seat; 601. Flange; 602. Contact seat head; 6021. Second contact finger; 603. Third conductive rod. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figures 1 to 4 As shown, in an embodiment of the present invention, a transformer oil-SF6 bushing interface high efficiency test device includes an experimental device, which includes a test riser 3, a test bushing 4, a disconnect switch 5 and a contact seat 6;

[0031] The supporting components include a first riser 1 and an oil-SF6 bushing 2;

[0032] The oil-SF6 bushing 2 includes a first lead 201, an interface 202, a first pressure-equalizing ball 203, and a second pressure-equalizing ball 204. The first lead 201 is arranged at the lower portion of the oil-SF6 bushing 2, the interface 202 is arranged at the upper portion of the oil-SF6 bushing 2, the first pressure-equalizing ball 203 is placed inside the lower portion of the oil-SF6 bushing 2, and the second pressure-equalizing ball 204 is placed inside the upper portion of the oil-SF6 bushing 2.

[0033] The surface of the test riser 3 is provided with a manhole 301 and a pressure relief device 302 from top to bottom;

[0034] A transfer raising seat 401 is provided at the lower end of the test sleeve 4, a shield 402 is provided on the upper flange of the transfer raising seat 401, the shield 402 and the transfer raising seat 401 are fixedly connected by insulating bolts, a pressure gauge 405 and a test tap 403 are symmetrically installed on the left and right sides of the surface of the transfer raising seat 401, a second lead 4021 is provided between the shield 402 and the test tap 403, a first conductive rod 404 is movably installed inside the test sleeve 4, the shield 402 is coaxially arranged with the outer side of the first conductive rod 404, a third equalizing ring 406 is movably installed on the surface of the top of the upper end of the test sleeve 4, a terminal board 407 is movably installed on the top of the upper end of the test sleeve 4, and the terminal board 407 is electrically connected to the external test equipment;

[0035] The disconnect switch 5 includes an operating handle 501, an operating rod 502, a gear set 503, a conductive head 504, a second conductive rod 505, a ball screw 5051, a first contact finger 506 and a third equalizing ball 507. The conductive head 504 is arranged inside the upper end of the test elevation seat 3, the second conductive rod 505 and the first contact finger 506 are arranged inside the conductive head 504, the conductive head 504 and the second conductive rod 505 are electrically connected through the first contact finger 506, the ball screw 5051 is arranged inside the second conductive rod 505, the gear set 503 is arranged at the upper end of the ball screw 5051, the left end of the operating rod 502 is movably connected to the gear set 503, the operating handle 501 is fixedly mounted on the top of the other end of the operating rod 502, the upper end of the conductive head 504 is flange-connected to the first conductive rod 404, and the third equalizing ball 507 is arranged at the connection point of the upper end of the conductive head 504;

[0036] The contact base 6 includes a flange 601, a contact base head 602 and a third conductive rod 603. The contact base head 602, the third conductive rod 603 and the flange 601 are connected from top to bottom by welding. A groove is opened inside the contact base head 602, and a second contact finger 6021 is embedded in the groove.

[0037] The working principle and beneficial effects of the above technical solution are as follows: when in use, by rotating the operating handle 501, the joystick 502, the gear set 503, and the ball screw 5051 will be driven to rotate together, thereby controlling the extension and retraction movement of the second conductive rod 505, thereby controlling whether the head of the second conductive rod 505 is inserted into the contact seat head 602 and whether it contacts the second contact finger 6021 inside the contact seat head 602, thereby realizing the control of the circuit connection and disconnection between the test bushing 4 and the oil-SF6 bushing 2 and the transformer.

[0038] like Figure 1 and Figure 2 As shown, in one embodiment, the interior of the first lifting seat 1 is filled with transformer oil, the first lifting seat 1 is mechanically connected to the transformer, the upper part of the oil-SF6 bushing 2 is connected to the flange 601 of the contact seat 6 through the interface 202, and the lower part of the oil-SF6 bushing 2 is electrically connected to the transformer through the first lead 201. The test lifting seat 3 and the oil-SF6 bushing 2 are connected and sealed through the flange interface, and the lower part of the oil-SF6 bushing 2 is connected to the first lifting seat 1 through the flange interface.

[0039] The working principle and beneficial effects of the above technical solution are as follows: when in use, the first lifting seat 1 is mechanically connected to the transformer, and then the lower part of the oil-SF6 bushing 2 is connected to the first lifting seat 1 through the flange interface, and at the same time, it is electrically connected to the transformer through the first lead 201, and then the test lifting seat 3 and the oil-SF6 bushing 2 are connected and sealed through the flange interface, and at the same time, the upper part of the oil-SF6 bushing 2 is connected to the flange 601 of the contact seat 6 through the interface 202, thereby completing the basic assembly.

[0040] like Figure 1 and Figure 2 As shown, in one embodiment, the test raising seat 3 and the test sleeve 4 are the main components of the exterior of the test device. The test raising seat 3 and the test sleeve 4 are connected through the adapter raising seat 401, and are connected and sealed to each other using a flange interface. The interior is filled with SF6 gas.

[0041] The working principle and beneficial effects of the above technical solution are: when in use, the test lifting seat 3 is flange-connected with the adapter lifting seat 401 at the bottom of the test sleeve 4, so that the sealing performance is better, and the interior of the test lifting seat 3 and the test sleeve 4 is filled with SF6 gas, which plays the role of arc extinguishing insulation.

[0042] like Figure 2 、 Figure 3 and Figure 4As shown, in one embodiment, the test tap 403 is grounded when performing a high voltage test, that is, the shield 402 is grounded, which plays the role of a uniform electric field. When performing a partial discharge test, the test tap 403 is led out, and the shield 402 plays the role of a capacitive screen for partial discharge measurement.

[0043] The working principle and beneficial effects of the above technical solution are as follows: when conducting a high voltage test, the test tap 403 is grounded to act as a grounding shield, and when conducting a partial discharge test, the test tap 403 needs to be led out. At this time, the shield 402 acts as a capacitive screen, so that the lead of the test tap 403 is transmitted to the partial discharge monitoring device, thereby indirectly detecting whether the bushing is partially discharged or the transformer is partially discharged.

[0044] like Figure 3 and Figure 4 As shown, in one embodiment, the rotation of the operating handle 501 drives the joystick 502, the gear set 503, and the ball screw 5051, thereby extending and retracting the second conductive rod 505, thereby connecting and disconnecting the circuit between the test bushing 4 and the oil-SF6 bushing 2 and the transformer.

[0045] The working principle and beneficial effects of the above technical solution are as follows: when in use, by rotating the operating handle 501, the joystick 502, the gear set 503, and the ball screw 5051 will be driven to rotate together, thereby controlling the extension and retraction movement of the second conductive rod 505, thereby controlling the circuit connection and disconnection of the test bushing 4 with the oil-SF6 bushing 2 and the transformer.

[0046] like Figure 3 and Figure 4 As shown, in one embodiment, after the second conductive rod 505 is extended, the head of the second conductive rod 505 is inserted into the contact seat head 602 and contacts the second contact finger 6021, and the test bushing 4 is electrically connected to the oil-SF6 bushing 2 and the transformer.

[0047] The working principle and beneficial effects of the above technical solution are as follows: when in use, the second conductive rod 505 extends, and its head is inserted into the contact seat head 602, and contacts with the second contact finger 6021 inside the contact seat head 602, thereby realizing electrical connection between the test bushing 4 and the oil-SF6 bushing 2 and the transformer.

[0048] Working principle and usage process:

[0049] When conducting a test, the SF6-air outlet bushing / test bushing 4 is used as a test pressurized bushing, and then the test bushing 4 is connected in series with the oil-SF6 bushing 2 of the transformer. During a factory test, current is loaded into the transformer through the oil-SF6 bushing 2, thereby verifying the insulation reliability of the bushing during the test. The SF6-air bushing outlet bushing / test bushing 4 has the characteristics of simple structure, low cost, and easy maintenance.

[0050] At the same time, a capacitance screen is designed in the test device, and the capacitance screen is led out through the test tap 403. During the factory test, the reference number of the test tap 403 can be transmitted to the partial discharge monitoring device to determine whether it is a partial discharge of the bushing or a partial discharge of the transformer. The device is also equipped with a disconnect switch 5. The disconnect switch 5 can connect and disconnect the SF6-air bushing outlet bushing / test bushing 4 and the oil-SF6 bushing 2. According to the requirements of different test projects, the bushings are connected or disconnected, so that there is no need to disassemble and assemble the equipment during the test, thereby improving the efficiency of the test.

[0051] The specific operation steps are as follows: by rotating the operating handle 501, the joystick 502, the gear set 503, and the ball screw 5051 rotate together, and then the extension and retraction movement of the second conductive rod 505 is controlled, thereby controlling whether the head of the second conductive rod 505 is inserted into the contact seat head 602 and whether it contacts the second contact finger 6021 inside the contact seat head 602, thereby realizing the control of the circuit connection and disconnection between the test bushing 4, the oil-SF6 bushing 2, and the transformer.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Transformer oil-SF6 bushing interface high efficiency test device, including experimental device, characterized by: The test device comprises a test riser (3), a test sleeve (4), a cut-off switch (5), a contact seat (6) and supporting components thereof; The supporting components include a first riser (1) and an oil-SF6 bushing (2); The oil-SF6 bushing (2) comprises a first lead (201), an interface (202), a first pressure-equalizing ball (203) and a second pressure-equalizing ball (204), wherein the first lead (201) is arranged at the lower part of the oil-SF6 bushing (2), the interface (202) is arranged at the upper part of the oil-SF6 bushing (2), the first pressure-equalizing ball (203) is placed inside the lower part of the oil-SF6 bushing (2), and the second pressure-equalizing ball (204) is placed inside the upper part of the oil-SF6 bushing (2); The surface of the test elevation seat (3) is provided with a manhole (301) and a pressure relief device (302) from top to bottom; The lower end of the test sleeve (4) is provided with a transfer elevation seat (401), a shield (402) is provided on the upper flange of the transfer elevation seat (401), the shield (402) and the transfer elevation seat (401) are fixedly connected by insulating bolts, a pressure gauge (405) and a test tap (403) are symmetrically installed on the left and right sides of the surface of the transfer elevation seat (401), a second lead (4021) is provided between the shield (402) and the test tap (403), a first conductive rod (404) is movably installed inside the test sleeve (4), the shield (402) and the outer side of the first conductive rod (404) are coaxially arranged, a third equalizing ring (406) is movably installed on the surface of the top of the upper end of the test sleeve (4), a terminal board (407) is movably installed on the top of the upper end of the test sleeve (4), and the terminal board (407) is electrically connected to the external test equipment; The disconnect switch (5) includes an operating handle (501), a joystick (502), a gear set (503), a conductive head (504), a second conductive rod (505), a ball screw (5051), a first contact finger (506) and a third pressure-equalizing ball (507), wherein the conductive head (504) is arranged inside the upper end of the test elevation seat (3), the second conductive rod (505) and the first contact finger (506) are arranged inside the conductive head (504), and the conductive head (504) and the second conductive rod (505) are connected to each other through the first contact finger. (506) is electrically connected, the ball screw (5051) is arranged inside the second conductive rod (505), the gear set (503) is arranged at the upper end of the ball screw (5051), the left end of the joystick (502) is movably connected to the gear set (503), the operating handle (501) is fixedly installed on the top of the other end of the joystick (502), the upper end of the conductive head (504) is flange-connected to the first conductive rod (404), and the third pressure-equalizing ball (507) is arranged at the connection of the upper end of the conductive head (504); The contact seat (6) comprises a flange (601), a contact seat head (602) and a third conductive rod (603); the contact seat head (602), the third conductive rod (603) and the flange (601) are connected from top to bottom by welding; a groove is provided inside the contact seat head (602), and a second contact finger (6021) is embedded inside the groove; The interior of the first elevation seat (1) is filled with transformer oil, and the first elevation seat (1) is mechanically connected to the transformer; The upper portion of the oil-SF6 bushing (2) is connected to the flange (601) of the contact seat (6) via an interface (202), and the lower portion of the oil-SF6 bushing (2) is electrically connected to the transformer via a first lead (201).

2. The transformer oil-SF6 bushing interface high-efficiency test device according to claim 1, characterized in that: The test raising seat (3) and the oil-SF6 bushing (2) are connected and sealed via a flange interface, and the lower part of the oil-SF6 bushing (2) is connected to the first raising seat (1) via a flange interface.

3. The transformer oil-SF6 bushing interface high-efficiency test device according to claim 1, characterized in that: The test elevation seat (3) and the test sleeve (4) are main components of the exterior of the test device. The test elevation seat (3) and the test sleeve (4) are connected via a transfer elevation seat (401), are connected and sealed with a flange interface, and are filled with SF6 gas.

4. The transformer oil-SF6 bushing interface high-efficiency test device according to claim 1, characterized in that: The test tap (403) is grounded when a high voltage test is performed, that is, the shield (402) is grounded, and plays the role of a uniform electric field. When a partial discharge test is performed, the test tap (403) is led out, and at this time, the shield (402) plays the role of a capacitive screen for partial discharge measurement.

5. The transformer oil-SF6 bushing interface high efficiency test device according to claim 1, characterized in that: The rotation of the operating handle (501) drives the joystick (502), the gear set (503), and the ball screw (5051), thereby extending and retracting the second conductive rod (505), thereby connecting and disconnecting the circuit between the test bushing (4), the oil-SF6 bushing (2), and the transformer.

6. The transformer oil-SF6 bushing interface high-efficiency test device according to claim 1, characterized in that: After the second conductive rod (505) is extended, the head of the second conductive rod (505) is inserted into the interior of the contact seat (602) and contacts the second contact finger (6021), and the test bushing (4) is electrically connected to the oil-SF6 bushing (2) and the transformer.

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